Newegg offers the refurbished Netgear 802.11n Wireless 4-Port Broadband Router, model no. WNR2000-100NAR, for $12.99 with free shipping. That's the lowest total price we could find for a refurb by $5, although we saw a refurbished unit for a buck less last week. This router offers 128-bit WEP, 64-bit WEP, WPA-PSK, and WPA2-PSK encryption. Other features include parental controls and an internal antenna.
A 30-day warranty applies, but it's unclear who backs it.